# 什么是计算摄像学

“计算摄影学是一门将计算机视觉、数字信号处理、图形学等深度交叉的新兴学科，旨在结合计算、数字传感器、光学系统和智能光照等技术，从成像机理上来改进传统相机，并将硬件设计与软件计算能力有机结合，突破经典成像模型和数字相机的局限性，增强或者扩展传统数字相机的数据采集能力，全方位地捕捉真实世界的场景信息。”

# 用数码相机采集光场

$L\left( 0,0,x,y \right){{|}_{x,y\in \text{sensor plane}}}$

Lytro

Lytro采用的是在传感器表面覆盖一层微镜头阵列[4]

PiCam

# 光场和3D

$L\left( x,u \right)={{\lambda }_{0}}L\left( {{x}_{0}},{{u}_{0}} \right)+{{\lambda }_{1}}L\left( {{x}_{1}},{{u}_{1}} \right)$

$L\left( x,u \right)={{\lambda }_{0}}L\left( {{x}_{00}},{{u}_{0}} \right)+{{\lambda }_{1}}L\left( {{x}_{01}},{{u}_{0}} \right)+{{\lambda }_{2}}L\left( {{x}_{10}},{{u}_{1}} \right)+{{\lambda }_{3}}L\left( {{x}_{11}},{{u}_{1}} \right)$

${{\lambda }_{0}}=\left( 1-\frac{\left| x-{{x}_{00}} \right|}{\left| {{x}_{01}}-{{x}_{00}} \right|} \right)\left( 1-\frac{\left| u-{{u}_{0}} \right|}{\left| {{u}_{0}}-{{u}_{1}} \right|} \right)$

${{\lambda }_{1}}=\left( 1-\frac{\left| x-{{x}_{01}} \right|}{\left| {{x}_{01}}-{{x}_{00}} \right|} \right)\left( 1-\frac{\left| u-{{u}_{0}} \right|}{\left| {{u}_{0}}-{{u}_{1}} \right|} \right)$

${{\lambda }_{2}}=\left( 1-\frac{\left| x-{{x}_{10}} \right|}{\left| {{x}_{11}}-{{x}_{10}} \right|} \right)\left( 1-\frac{\left| u-{{u}_{1}} \right|}{\left| {{u}_{0}}-{{u}_{1}} \right|} \right)$

${{\lambda }_{3}}=\left( 1-\frac{\left| x-{{x}_{11}} \right|}{\left| {{x}_{11}}-{{x}_{10}} \right|} \right)\left( 1-\frac{\left| u-{{u}_{1}} \right|}{\left| {{u}_{0}}-{{u}_{1}} \right|} \right)$

[3] A. Gershun, “The light field,” J. Math. Phys., Vol. 18, pp. 51–151, 1939

[4] R. Ng, "Digital Light Field Photography," PhD thesis, Stanford University, Stanford, CA (2006)

[5] T. Georgiev, A. Lumsdaine, "Focused plenoptic camera and rendering," Journal of Electronic Imaging 19(2), 2010

[6] K. Venkataraman, et. al "PiCam: An Ultra-Thin High Performance Monolithic Camera Array," ACM Transactions on Graphics(SIGGRAPH) 2013

[7] http://imoz.jp/research.html

posted @ 2015-01-20 13:27  達聞西  阅读(...)  评论(...编辑  收藏